Initial re-working of Roadmap.md (#34)

* Initial re-working of Roadmap.md

* Update Roadmap.md

Co-Authored-By: ryandemopoulos <[email protected]>

* Update Roadmap.md

* Update Roadmap.md

* Update Roadmap.md

* Removed Feedback section/contents for later reintroduction to README.  Added Porting Status section.

* Swapped 'accept' with 'merge' to be explicit about what will be possible with PRs.

* Updated Roadmap with 'component

* Rename roadmap file

Author: ryandemopoulos

roadmap.md

@@ -0,0 +1,30 @@
+# WPF for .NET Core Roadmap
+
+This roadmap communicates priorities for evolving and extending the scope of WPF for .NET Core.
+
+At present, our primary focus is enabling the following for .NET Core 3.0:
+
+* Achieve WPF functional and performance parity compared to .NET Framework
+* Publish remaining WPF components to the repo
+* Publish (and write) more WPF tests to the repo
+
+As we complete those goals, we'll update our roadmap to include additional feature/capability areas we will focus on next.
+
+## Timeline for Open Source
+| Milestone | Release Date |
+|---|---|
+|Initial launch of WPF for .NET Core repository (beginning with System.Xaml)|Dec 4, 2018|
+|Ability to merge PRs from community|Early 2019|
+|Roadmap update for feature focus areas|Early 2019|
+|Add remaining WPF for .NET Core components to repository|Continues thru 2019|
+
+## Porting Status
+
+The port from WPF for .NET Framework is still in progress. Currently this repository contains these components:
+
+* Components:
+  * System.Xaml
+* Tests:
+  * DrtXaml
+
+Components in this repository eventually roll up to the `Microsoft.NET.Sdk.WindowsDesktop` SDK.